Heat-insulating compound.



i SPECIFICATION forming part of Letters Patent No. 772,181,:1ated October 11, 1904.

- 5 dered asbestos seventy pounds; ow

twen'trp ounds' flour, ten pounds; ce-

p ,UNITED STATES Application filed February 2,1904.

To all whom. it may concern:

Be it known that I, J osnrn D. Soon, a subject of the King of Great Britain, and a resident of Shields, England, have invented a new 5 and Im )roved Heat-Insulating Compound, of which the following is a full, clear, and exact. description.

This invention relates to a heat-insulating compound useful in various connections, but especially intended as a covering for boilers, steam-pipes, and equivalent structures to prevent the loss of heat by radiation.

The insulating compound is composed of asbestos and mica with a starch-like bonding, enabling the compound to be prepared in plastic form and spread over the surface to which it is to be applied, after which the compound will set permanently to said surface.

I will now give a specific example of one manner of compounding and applying the invention, and subsequently in the claims I will .set forth the actual scope of my invention.

This following ingredients should be thoroug y mixe in t e proportions given: ow-

aim

mica m ten pounds. Tomredients mm as escribed a quantity of water or other liquid should be added sufficient E form a paste or plaster-like substance, which may be applied to the surface to be protected and allowed to harden to form a permanent covering.

In the practical employment of the invention it will be found convenient not to mix the ingredients with water until the time when the compound is to be actually em ployed. Assuming that it is to be applied to a boiler, the surface of the boiler should be pe fectly cleaned from dirt, grease, rust, or th ,like, and the insulating compound, with the proper quantity of water mixed therewith to form a plaster-like substance, should be applied, preferably with the hand and trowel. First a thin coat should be applied and allowed per-.1 fectly to dry, after which a number of additional coatsshould be applied until the entire Patented October 11, 1904.

PATENT OFFICE.

JOSEPH D. SCOTT, OF SHIELDS, ENGLAND.

HEAT-INSULATING comPounn.

Serial No. 191,693. (No specimens.)

ness. Each coat should be relatively thin.. For instance, th ree-eighths to one-half an inch is regarded as quite sufiicient, and each coat should be allowed to become perfectly dry and set before putting on another coat. The last coat may be leveled ofl? in any desired manner. After the compound has been applied and allowed to dry and set it is preferable to pai n%, ygni s h, or otherwise ,corerthe suifagoft e co pWr-btectit against moisture. T A The compound is sufliciently adhesive to hold securely to the surface to which it is applied without the need of laggings and external fastenings, as usually employed.

Various forms of starch-like or starch-contaifiiif'sfibsti n'des mav Be e nployed IQSlfigll oi iiour; But I have found GOIIIIDEICIBI' *licatl he Hour 1166'; best adapted for the purpose.

serves as a bonding to cause the various 1ngredients to assume a paste-likeform. By extensive experiments I have found that flour or other starch-like substances are the only. materials which can be used to cause the asbestos and mica to combine for heat-resisting purposes. The cement is pre erably of the class known as Eortland cement and is used to cause the compoun se an iarden, giving it its permanent form.

Having thus described my invention, I claim as new and desire to secure by letters Patent- 1. A heat-insulating compound, comprising powdered asbestos, powdered mica, a bonding substance, and cement, in about the proportions specified.

2. A heat-insulating compound comprising powdered asbestos, powdered mica, a starchlike substance, and cement, substantially as described.

Intestimony whereof Ihave signed my name to this specification in the presence of two s'nbscribing witnesses.

JOSEPH D. SCOTT.

Witnesses:

Isaac B. Owens,

mass lies over the boiler with sufiicient thick JNo. Rrrrna. 

